/Engine/Plugins/Online/OnlineFramework/Source/Rejoin/Public/RejoinCheck.h
Rejoin the last session if one is found. One final call to CheckRejoinStatus is made to verify the session still exists
void RejoinLastSession ( const [FOnRejoinLastSessionComplete](API\Plugins\Rejoin\FOnRejoinLastSessionComplete) & InCompletionDelegate )